SORMAS-Foundation#3616 Do not extend ExternalVisitsResourceTest from TestCase

Author: HolgerReiseVSys

sormas-rest/src/test/java/de/symeda/sormas/rest/ExternalVisitsResourceTest.java

@@ -1,12 +1,8 @@
 package de.symeda.sormas.rest;
 
-import com.fasterxml.jackson.core.type.TypeReference;
-import com.fasterxml.jackson.databind.ObjectMapper;
-import junit.framework.TestCase;
-import org.junit.Test;
+import static org.junit.Assert.assertEquals;
 
 import java.io.IOException;
-
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Files;
 import java.nio.file.Paths;
@@ -16,7 +12,12 @@
 import java.util.Map;
 import java.util.stream.Stream;
 
-public class ExternalVisitsResourceTest extends TestCase {
+import org.junit.Test;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class ExternalVisitsResourceTest {
 
 	@Test
 	/*